Coloured scanning electron micrograph (SEM) of Woven wool fabric (herringbone pattern). Wool is the fibre derived from the fur of animals of the Caprinae family, principally sheep (hair of certain species of other mammals such as goats, alpacas, llamas and rabbits may also be called wool). Wool has two qualities that distinguish it from hair or fur: the cuticle or outer layer is scaly and is crimped (in some fleeces the wool fibres have more than 20 bends per inch). Beneath this is the cortex, the bulk of hair which contains hair pigments. At the centre is the medulla, which may be hollow. Hair cells are dead except for a layer at the base of the root. Cells in this layer continue to divide forming new cells while pushing the older ones upward. Magnification: x20 when shortest axis printed at 25 millimetres.
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